Ski edge profile

ABSTRACT

The invention relates to a ski edge profile made from steel. To further improve the sliding properties compared to the ski edge profiles which are known from the prior art, according to the invention it is proposed for the ski edge profile to consist of a steel alloy with a relatively low thermal conductivity.

[0001] The present invention relates to a ski edge profile made from steel and to a ski having a ski edge profile.

[0002] A ski has a base body which generally consists of plastic and generally has a structure comprising a plurality of layers, which may be reinforced with glass fibers or carbon fibers, in order to achieve defined elasticity and shock absorption properties. The side edges of the running surface of the ski, which are subject to particularly high loads, are formed by ski edge profiles made from steel. This is a substantially L-shaped profile, one limb of which is unreleasably embedded in the base body. The profile head, which is generally ground at right angles, extends along the running surface edge, which is subject to particularly high loads.

[0003] It is known to use ski edge profiles made from steel, preferably hardened steel. A ski edge of this type is described, for example, in DE 297 05 070 U1. These known ski edges, which consist of hardenable steel alloys, have excellent properties in particular in terms of their durability and resistance to wear.

[0004] In view of the above, the invention is based on the object of providing a ski edge profile which further improves the sliding properties of a ski provided with ski edge profiles of this type, in particular under extreme loads as occur in ski racing.

[0005] To achieve this object, it is proposed, according to the invention, for the ski edge profile to consist of a steel alloy with a relatively low thermal conductivity.

[0006] The invention is based on the surprising discovery that although it is almost impossible to significantly improve the sliding properties any further by improving the mechanical materials properties of the ski edge, there is still a potential for optimization in terms of the thermal properties, which has hitherto not been exploited.

[0007] The approach of the invention in detail provides for the use in particular of steel alloys which, on account of their alloying additions, have a lower thermal conductivity than the hardenable C steels which have been used hitherto.

[0008] The reduction in the thermal conductivity of the ski edge profile leads to a reduced dissipation of the heat produced in the edge region during skiing. This reduced dissipation of heat ensures that an improved sliding film is formed between the ski edge and the snow (as a result of local, brief melting of the snow), which improves the sliding properties so that the ski is faster.

[0009] The hardness, the wear resistance, the dimensional accuracy and the edge-holding properties of the ski edge made from steel are not adversely affected.

[0010] To achieve a reduced thermal conductivity in accordance with the invention, a steel alloy having an increased level of alloying elements which reduce the thermal conductivity is used. Such elements may, for example, be added silicon. The silicon content may be approximately between 0.3% and 3.0%, based on the melt analysis, preferably between 0.5% and 2.5%.

[0011] Other known constituents which induce the formation of a solid solution may also be used.

[0012] Silicon-alloyed carbon steels with a carbon content in the range from 0.5% -0.8% and a silicon content in the range 1.2% -2.3% (in % by weight) are particularly suitable for implementing the invention.

[0013] The table which follows gives the chemical analysis and typical values for the chemical analysis, density and thermal conductivity X, specifically for an alloy 1 which is used in the prior art to produce ski edges and for an alloy 2 according to the invention: Chemical Analysis Alloy 1 Alloy 2 (%) (Base) (Invention) C 0.55-0.80 0.50-0.80 Si 0.03-0.40 1.20-2.30 Mn 0.50-0.90 0.50-1.10 P max. 0.035 max. 0.035 S max. 0.035 max. 0.035 Cr 0.01-0.40 0.05-0.80 Cu max. 0.30 max. 0.30 Ni max. 0.30 max. 0.30 Mo max. 0.10 max. 0.10 Al max. 0.070 0.001-0.25 Sn max. 0.05 As max. 0.05 V 0.001-0.40 Nb max. 0.05 Sb max. 0.05 B max. 0.01 Typical values Alloy 1 Alloy 2 C 0.690 0.620 Si 0.240 1.930 Mn 0.620 0.910 P 0.007 0.014 S 0.014 0.007 Cr 0.037 0.350 Cu 0.041 0.170 Ni 0.025 0.130 Mo 0.010 0.040 Al 0.003 0.006 Density δ (g/cm³) 7.819 7.703 Thermal conductivity κ (W/mK) At ° C. −20 45.5 22.8 −10 46.1 23.3    0 46.6 23.7   10 47.0 24.2   20 47.4 24.7

[0014] The thermal conductivity of the alloy 2, which is reduced by virtually half compared to the known alloy 1 in the temperature range of interest from −20° C. to +20° C. can be seen particularly clearly from the graph presented below. 

1. A ski edge profile made from steel, characterized in that it consists of a steel alloy with a relatively low thermal conductivity.
 2. The ski edge profile as claimed in claim 1, characterized in that the thermal conductivity of the steel alloy is reduced by nonmetallic, semimetallic and/or metallic alloying elements.
 3. The ski edge profile as claimed in claim 1 or 2, characterized in that the alloying elements which reduce the thermal conductivity form approximately 1.0% to 3.0%, preferably 1.20-2.50%, based on the melt analysis.
 4. The ski edge profile as claimed in one of claims 1 to 3, characterized in that the alloying elements contain silicon as the main alloying element.
 5. The ski edge profile as claimed in one of claims 1 to 4, characterized in that the alloying element present is silicon in an amount of between approximately 0.3% and approximately 3.0%, based on the melt analysis, preferably between approximately 0.5% and approximately 2.5%.
 6. The ski edge profile as claimed in one of claims 1 to 5, characterized in that it consists of a silicon-alloyed carbon steel.
 7. The ski edge profile as claimed in one of claims 1 to 6, characterized in that it consists of a silicon-alloyed carbon steel containing approximately 0.5% to 0.8% of carbon and approximately 1.2% to approximately 2.3% of silicon.
 8. The ski edge profile as claimed in one of claims 1 to 7, characterized in that it consists of a steel alloy whose thermal conductivity is reduced by additions of constituents which induce the formation of a solid solution.
 9. The ski edge profile as claimed in one of claims 1 to 8, characterized in that it consists of a steel alloy with a thermal conductivity which is reduced by at least about a quarter, preferably by about half, compared to conventional steel alloy.
 10. The ski edge profile as claimed in one of claims 1 to 9, characterized in that the thermal conductivity in the temperature range from −20 to +20° C is less than approximately 35 W/mK, preferably less than 30 W/mK. 